View Compilation Error

0_0_7671586_4933.c:20: error: syntax error before '&' token
0_0_7671586_4933.c: In function `calculate':
0_0_7671586_4933.c:23: error: `max' undeclared (first use in this function)
0_0_7671586_4933.c:23: error: (Each undeclared identifier is reported only once
0_0_7671586_4933.c:23: error: for each function it appears in.)
0_0_7671586_4933.c:23: error: `seq' undeclared (first use in this function)
0_0_7671586_4933.c:25: error: `maxsum' undeclared (first use in this function)
0_0_7671586_4933.c:26: error: `rear' undeclared (first use in this function)
0_0_7671586_4933.c:28: error: `n' undeclared (first use in this function)